PDF malware analysis — malicious · 8bb558789981d392

MALICIOUS

PDF

44.4 KB

MD5: 003a63628d49eed55f81fbd38b78905a SHA-1: 9d3275e896b039c16921b7e7747931e868905b7e SHA-256: 8bb558789981d3929ea1d20c0176ec3fca5b35c0b41db4adb95fe224278df972

166 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF file contains JavaScript embedded within an annotation subject, which is a known technique for exploiting vulnerabilities like CVE-2007-5659. The heuristics indicate that this JavaScript is decoded from a hex-encoded stager and is designed to execute malicious code. The presence of U3D content also suggests an attempt to exploit Adobe Reader vulnerabilities. The primary attack vector appears to be the exploitation of CVE-2007-5659 via a malicious PDF, leading to the execution of a JavaScript stager.

Heuristics 7

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED

PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
Annotation subject callee-key hex JavaScript stager high PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER

PDF JavaScript uses syncAnnotScan()/getAnnots() to read an indirect annotation /Subject stream, percent-decodes it through marker replacement, then uses a callee.toString()-derived key to decode and eval the final exploit stage.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `5aa3057960874477e0379157bd0cd3422fe6540096e159cdca26941279272f56`	pdf-javascript-stream	PDF /JS object 9 at offset 0x42F5	442 bytes
`annotation_subject_callee_hex_stage_000.js` `7b44bee96c5d557bfe83c4a8bd69f39cbc5602f66ac2726a2df0c91c9fd7d0d2`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x1B31	5470 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `76d31ee4ec61233eb306e9292e534e835358e2f3330e0ec0724052e50076ee5c`	deobfuscated-js	PDF JavaScript deobfuscation pass	308058 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`u3d_00_off0000452f.bin` `fb27c6f6ffe2b08a88f79f344ef3cb4f85460ac81a062194b6fd84ab6e48b628`	pdf-3d-stream	PDF U3D 3D stream at offset 0x452F	28021 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.79, consistent with packed or encrypted content.

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